Loft insulation usually sold as loft roll insulation.
Insulation in the loft is a used to reduce the amount of heat that is lost through the roof and this will be reflect on the reduced energy bills that will be seen. This is great way to increase energy efficiency.
Top loft insulation products
Top loft insulations are Knauf Earthwool and Isover Spacesaver, to see a whole list of products see here .
Knauf Earthwool is made using Ecose technology from glass mineral wool. It is easy to use and sold as a combo cut product which means it is perforated into sections for easy installation. Other benefits include fire rated to class A1and excellent thermal performance.
Isover spacesaver has similar properties to the above.